42380081 has 2 divisors, whose sum is σ = 42380082. Its totient is φ = 42380080.

The previous prime is 42380057. The next prime is 42380087. The reversal of 42380081 is 18008324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 19722481 = 4760^2 + 4441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42380081 is a prime.

It is a super-2 number, since 2×42380081² = 3592142531133122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42380081.

It is not a weakly prime, because it can be changed into another prime (42380087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21190040 + 21190041.

It is an arithmetic number, because the mean of its divisors is an integer number (21190041).

Almost surely, 2^42380081 is an apocalyptic number.

It is an amenable number.

42380081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42380081 is an equidigital number, since it uses as much as digits as its factorization.

42380081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 42380081 is about 6509.9985407064. The cubic root of 42380081 is about 348.6480662856.

The spelling of 42380081 in words is "forty-two million, three hundred eighty thousand, eighty-one".